Messages in this thread Patch in this message | | | From | Alan Ott <> | Subject | [PATCH v2 1/2] 6lowpan: Make a copy of skb's delivered to 6lowpan | Date | Wed, 29 Aug 2012 22:39:00 -0400 |
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Since lowpan_process_data() modifies the skb (by calling skb_pull()), we need our own copy so that it doesn't affect the data received by other protcols (in this case, af_ieee802154).
Signed-off-by: Alan Ott <alan@signal11.us> --- net/ieee802154/6lowpan.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c index 6a09522..ce33b02 100644 --- a/net/ieee802154/6lowpan.c +++ b/net/ieee802154/6lowpan.c @@ -1133,6 +1133,8 @@ static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { + struct sk_buff *local_skb; + if (!netif_running(dev)) goto drop; @@ -1144,7 +1146,12 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ - lowpan_process_data(skb); + local_skb = skb_copy(skb, GFP_ATOMIC); + if (!local_skb) + goto drop; + lowpan_process_data(local_skb); + + kfree_skb(skb); break; default: break; -- 1.7.0.4
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